Fix .gitignore, add missing files

8 files changed, 1503 insertions, 0 deletions

diff --git a/src/mdevd/PARSING.txt b/src/mdevd/PARSING.txt
new file mode 100644
index 0000000..500a8a7
--- /dev/null
+++ b/src/mdevd/PARSING.txt
@@ -0,0 +1,191 @@
+ /etc/mdev.conf parsing
+
+ First pass: just count envmatches and scriptelems, to allocate arrays in the stack.
+
+class	|	0	1	2	3	4	5	6	7	8
+st\ev	|	\0	space	;	$	#	-	@	\n	other
+
+START	|				env+ele			ele		ele
+00	|	END	START	X	ENDLINE	ENDLINE	MINUS	ENDLINE	START	DEVVAR
+
+MINUS	|				env+ele			ele		ele
+01	|	X	X	X	ENDLINE	X	X	ENDLINE	X	DEVVAR
+
+DEVVAR	|			env
+02	|	X	ENDLINE	SEMI	DEVVAR	X	DEVVAR	DEVVAR	X	DEVVAR
+
+SEMI	|
+03	|	X	X	X	DEVVAR	X	DEVVAR	DEVVAR	X	DEVVAR
+
+ENDLINE	|
+04	|	END	ENDLINE	ENDLINE	ENDLINE	ENDLINE	ENDLINE	ENDLINE	START	ENDLINE
+
+ END = 05, X = 06
+ States -> 0x00 to 0x06
+ Actions -> 0x10 (add an envmatch) and 0x20 (add a scriptelem)
+ Everything fits easily in an unsigned char.
+
+
+ Second pass: we need to fill the envmatches and scriptelems with values.
+ The whole mdev.conf semantics must be encoded in here.
+
+class	|	`	a	b	c	d	e	f	g	h	i	j	k	l	m	n	o	p
+st\ev	|	\0	space	;	$	#	-	@	\n	,	=	>	:	*	!	0-7	8-9	other
+
+START	|				$		cont	@	+	m|d			m|d	m|d	m|d	m|d	m|d	m|d
+00	|	END	START	X	ENV1	COMMENT	MINUS	TOMAJ	START	DEVNAME	X	X	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME
+
+COMMENT	|								+
+01	|	END	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	START	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT
+
+MINUS	|				$			@		m|d			m|d	m|d	m|d	m|d	m|d	m|d
+02	|	X	X	X	ENV1	X	X	TOMAJ	X	DEVNAME	X	X	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME
+
+ENV1	|				m|v		m|v	m|v		m|v		m|v	m|v	m|v	m|v	m|v	m|v	m|v													
+03	|	X	X	X	INVAR1	X	INVAR1	INVAR1	X	INVAR1	X	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1
+
+INVAR1	|										z
+04	|	X	X	X	INVAR1	X	INVAR1	INVAR1	X	INVAR1	TOVAL1	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1	INVAR1
+
+TOVAL1	|						m	m		m		m	m	m	m	m	m	m
+05	|	X	X	X	X	X	INVAL1	INVAL1	X	INVAL1	X	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1
+
+INVAL1	|		z|re$
+06	|	X	TOUSER	X	INVAL1	X	INVAL1	INVAL1	X	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1	INVAL1
+
+TOMAJ	|															m	m
+07	|	X	X	X	X	X	X	X	X	X	X	X	X	X	X	INMAJ	INMAJ	X
+
+INMAJ	|									z|mj
+08	|	X	X	X	X	X	X	X	X	TOMIN	X	X	X	X	X	INMAJ	INMAJ	X
+
+TOMIN	|															m	m
+09	|	X	X	X	X	X	X	X	X	X	X	X	X	X	X	INMIL	INMIL	X
+
+INMIL	|		z|ml|h				z|ml
+0a	|	X	TOUSER	X	X	X	TOMIH	X	X	X	X	X	X	X	X	INMIL	INMIL	X
+
+TOMIH	|															m	m
+0b	|	X	X	X	X	X	X	X	X	X	X	X	X	X	X	INMIH	INMIH	X
+
+INMIH	|		z|mh
+0c	|	X	TOUSER	X	X	X	X	X	X	X	X	X	X	X	X	INMIH	INMIH	X
+
+DEVNAME	|		z|re								z|v
+0d	|	X	TOUSER	X	DEVNAME	X	DEVNAME	DEVNAME	X	DEVNAME	TORE	X	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME
+
+TORE	|				m		m	m		m	m	m	m	m	m	m	m	m
+0e	|	X	X	X	INRE	X	INRE	INRE	X	INRE	INRE	INRE	INRE	INRE	INRE	INRE	INRE	INRE
+
+INRE	|			z|re$
+0f	|	X	X	TODEV	INRE	X	INRE	INRE	X	INRE	INRE	INRE	INRE	INRE	INRE	INRE	INRE	INRE
+
+TODEV	|				m		m	m		m			m	m	m	m	m	m
+10	|	X	X	X	LASTRE	X	DEVNAME	DEVNAME	X	DEVNAME	X	X	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME	DEVNAME
+
+LASTRE	|		z|re
+11	|	X	TOUSER	X	LASTRE	X	LASTRE	LASTRE	X	LASTRE	LASTRE	LASTRE	LASTRE	LASTRE	LASTRE	LASTRE	LASTRE	LASTRE
+
+TOUSER	|						m									m	m	m
+12	|	X	TOUSER	X	X	X	INUSER	X	X	X	X	X	X	X	X	INUSER	INUSER	INUSER
+
+INUSER	|												z|u
+13	|	X	X	X	X	X	INUSER	X	X	X	X	X	TOGRP	X	X	INUSER	INUSER	INUSER
+
+TOGRP	|						m									m	m	m
+14	|	X	X	X	X	X	INGRP	X	X	X	X	X	X	X	X	INGRP	INGRP	INGRP
+
+INGRP	|		z|g
+15	|	X	TOMODE	X	X	X	INGRP	X	X	X	X	X	X	X	X	INGRP	INGRP	INGRP
+
+TOMODE	|															m
+16	|	X	TOMODE	X	X	X	X	X	X	X	X	X	X	X	X	INMODE	X	X
+
+INMODE	|		z|M						z|M|L|+
+17	|	X	TOPATH	X	X	X	X	X	START	X	X	X	X	X	X	INMODE	X	X
+
+TOPATH	|	L			r	L		a	L|+		=	>		r|a	!
+18	|	END	TOPATH	X	CMD	COMMENT	X	CMD	START	X	PATH	PATH	X	CMD	TOCMD	X	X	X
+
+PATH	|						p	p		p	p		p		p	p	p	p
+19	|	X	X	X	X	X	INPATH	INPATH	X	INPATH	INPATH	X	INPATH	X	INPATH	INPATH	INPATH	INPATH
+
+INPATH	|	L	z			z|L			z|L|+
+1a	|	END	TOCMD	X	X	COMMENT	INPATH	INPATH	START	INPATH	INPATH	X	INPATH	X	INPATH	INPATH	INPATH	INPATH
+
+TOCMD	|	L			r	L		a	L|+					r|a
+1b	|	END	TOCMD	X	CMD	COMMENT	X	CMD	START	X	X	X	X	CMD	X	X	X	X
+
+CMD	|		c		c		c	c		c	c	c	c	c	c	c	c	c
+1c	|	X	INCMD	X	INCMD	X	INCMD	INCMD	X	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD
+
+INCMD	|	L							z|L|+
+1d	|	END	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	START	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD	INCMD
+
+st/ev	|	\0	space	;	$	#	-	@	\n	,	=	>	:	*	!	0-7	8-9	other
+class	|	`	a	b	c	d	e	f	g	h	i	j	k	l	m	n	o	p
+
+END = 1e, X = 1f
+
+ States : 30+2. They fit exactly into 5 bits.
+ Actions: 25.
+
+ 0x80000000	unused, to avoid having to explicitly write U everywhere
+ 0x40000000	$: prepare an envmatch, the scriptelem is DEVMATCH_NOTHING
+ 0x20000000	@: the scriptelem is DEVMATCH_MAJMIN
+ 0x10000000	d: the scriptelem is DEVMATCH_DEVRE
+ 0x08000000	cont: scriptelem.flagcont = 1
+ 0x04000000	m: set the marker
+ 0x02000000	z: zero the current character
+ 0x01000000	re$: compile regex, finalize envmatch
+ 0x00800000	mj: compute maj
+ 0x00400000	ml: compute minlo
+ 0x00200000	h: minhi = minlo
+ 0x00100000	mh: compute minhi
+ 0x00080000	re: compile regex -> devmatch
+ 0x00040000	v: mark is a variable name, prepare envmatch
+ 0x00020000	u: compute uid
+ 0x00010000	g: compute gid
+ 0x00008000	M: compute mode
+ 0x00004000	L: finalize/accept scriptelem, move to next one
+ 0x00002000	r: elem->cmdtype |= ACTION_REMOVE
+ 0x00001000	a: elem->cmdtype |= ACTION_ADD
+ 0x00000800	=: elem->movetype = MOVEINFO_MOVE
+ 0x00000400	>: elem->movetype = MOVEINFO_MOVEANDLINK
+ 0x00000200	!: elem->movetype = MOVEINFO_NOCREATE
+ 0x00000100	p: set movepath
+ 0x00000080	c: set command
+ 0x00000040	+: line++
+ 0x00000020	unused.
+
+ Actions + states fit in a uint32_t.
+
+ To debug script_secondpass: at the start of the loop, add
+
+    LOLDEBUG("state: %02x  char: %c  newstate: %02x  actions: %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", state, s[pos] == '\n' ? '\\' : s[pos], what & 0x1f,
+    what & 0x40000000 ? "$ " : "",
+    what & 0x20000000 ? "@ " : "",
+    what & 0x10000000 ? "d " : "",
+    what & 0x08000000 ? "cont " : "",
+    what & 0x04000000 ? "m " : "",
+    what & 0x02000000 ? "z " : "",
+    what & 0x01000000 ? "re$ " : "",
+    what & 0x00800000 ? "mj " : "",
+    what & 0x00400000 ? "ml " : "",
+    what & 0x00200000 ? "h " : "",
+    what & 0x00100000 ? "mh " : "",
+    what & 0x00080000 ? "re " : "",
+    what & 0x00040000 ? "v " : "",
+    what & 0x00020000 ? "u " : "",
+    what & 0x00010000 ? "g " : "",
+    what & 0x00008000 ? "M " : "",
+    what & 0x00004000 ? "L " : "",
+    what & 0x00002000 ? "r " : "",
+    what & 0x00001000 ? "a " : "",
+    what & 0x00000800 ? "= " : "",
+    what & 0x00000400 ? "> " : "",
+    what & 0x00000200 ? "! " : "",
+    what & 0x00000100 ? "p " : "",
+    what & 0x00000080 ? "c " : "",
+    what & 0x00000040 ? "+ " : "") ;
+
diff --git a/src/mdevd/deps-exe/mdevd b/src/mdevd/deps-exe/mdevd
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/mdevd/deps-exe/mdevd
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/mdevd/deps-exe/mdevd-coldplug b/src/mdevd/deps-exe/mdevd-coldplug
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/mdevd/deps-exe/mdevd-coldplug
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/mdevd/deps-exe/mdevd-netlink b/src/mdevd/deps-exe/mdevd-netlink
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/mdevd/deps-exe/mdevd-netlink
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/mdevd/mdevd-coldplug.c b/src/mdevd/mdevd-coldplug.c
new file mode 100644
index 0000000..dabd678
--- /dev/null
+++ b/src/mdevd/mdevd-coldplug.c
@@ -0,0 +1,133 @@
+/* ISC license. */
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/buffer.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/direntry.h>
+#include "mdevd.h"
+
+#define USAGE "mdevd-coldplug [ -s slashsys ]"
+#define dieusage() strerr_dieusage(100, USAGE)
+#define die1() strerr_diefu1sys(111, "write to stdout")
+
+static inline void create_event (int fddir, char const *sysdev, char const *sub, char const *name)
+{
+  if (faccessat(fddir, "dev", R_OK, AT_EACCESS) < 0)
+  {
+    if (errno == ENOENT) return ;
+    strerr_diefu6sys(111, "access dev in ", sysdev, "/", sub, "/", name) ;
+  }
+  if (buffer_put(buffer_1, "add@/", 5) < 0
+   || buffer_puts(buffer_1, sub) < 0
+   || buffer_put(buffer_1, "/", 1) < 0
+   || buffer_puts(buffer_1, name) < 0
+   || buffer_put(buffer_1, "\0ACTION=add\0DEVPATH=/dev/", sizeof("\0ACTION=add\0DEVPATH=/dev/") - 1) < 0
+   || buffer_puts(buffer_1, sub) < 0
+   || buffer_put(buffer_1, "/", 1) < 0
+   || buffer_puts(buffer_1, name) < 0
+   || buffer_put(buffer_1, "\0SUBSYSTEM=", sizeof("\0SUBSYSTEM=") - 1) < 0)
+    die1() ;
+
+  {
+    char *p ;
+    ssize_t r ;
+    char buf[PATH_MAX] ;
+    r = readlinkat(fddir, "subsystem", buf, PATH_MAX - 1) ;
+    if (r < 0) strerr_diefu6sys(111, "readlink subsystem in ", sysdev, "/", sub, "/", name) ;
+    buf[r] = 0 ;
+    p = strrchr(buf, '/') ;
+    if (p && buffer_put(buffer_1, p+1, strlen(p)) < 0) die1() ;
+  }
+
+  {
+    size_t len ;
+    size_t i = 0 ;
+    char buf[UEVENT_MAX_SIZE] ;
+    int fd = openat(fddir, "uevent", O_RDONLY) ;
+    if (fd < 0)
+      strerr_diefu6sys(111, "open uevent in ", sysdev, "/", sub, "/", name) ;
+    len = allread(fd, buf, UEVENT_MAX_SIZE) ;
+    if (!len) strerr_diefu6sys(111, "read uevent in ", sysdev, "/", sub, "/", name) ;
+    close(fd) ;
+    for (; i < len ; i++) if (buf[i] == '\n') buf[i] = 0 ;
+    if (buffer_put(buffer_1, buf, len) < 0) die1() ;
+  }
+
+  if (buffer_put(buffer_1, "", 1) < 1) die1() ;
+}
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  char const *slashsys = "/sys" ;
+  size_t slashsyslen ;
+  PROG = "mdevd-coldplug" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "s:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 's' : slashsys = l.arg ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+
+  slashsyslen = strlen(slashsys) ;
+  {
+    int fdsysdev ;
+    DIR *dirsysdev ;
+    char sysdev[slashsyslen + 5] ;
+    memcpy(sysdev, slashsys, slashsyslen) ;
+    memcpy(sysdev + slashsyslen, "/dev", 5) ;
+    fdsysdev = open(sysdev, O_RDONLY | O_DIRECTORY) ;
+    if (fdsysdev < 0) strerr_diefu2sys(111, "open ", sysdev) ;
+    dirsysdev = fdopendir(fdsysdev) ;
+    if (!dirsysdev) strerr_diefu2sys(111, "fdopendir ", sysdev) ;
+    for (;;)
+    {
+      direntry *d ;
+      int fdsub ;
+      DIR *dirsub ;
+      errno = 0 ;
+      d = readdir(dirsysdev) ;
+      if (!d) break ;
+      if (d->d_name[0] == '.') continue ;
+      fdsub = openat(fdsysdev, d->d_name, O_RDONLY | O_DIRECTORY) ;
+      if (fdsub < 0) strerr_diefu4sys(111, "open ", sysdev, "/", d->d_name) ;
+      dirsub = fdopendir(fdsub) ;
+      if (!dirsub) strerr_diefu4sys(111, "fdopendir ", sysdev, "/", d->d_name) ;
+      for (;;)
+      {
+        direntry *dd ;
+        int fddevice ;
+        errno = 0 ;
+        dd = readdir(dirsub) ;
+        if (!dd) break ;
+        if (dd->d_name[0] == '.') continue ;
+        fddevice = openat(fdsub, dd->d_name, O_RDONLY | O_DIRECTORY) ;
+        if (fddevice < 0) strerr_diefu6sys(111, "open ", sysdev, "/", d->d_name, "/", dd->d_name) ;
+        create_event(fddevice, sysdev, d->d_name, dd->d_name) ;
+        close(fddevice) ;
+      }
+      if (errno) strerr_diefu4sys(111, "readdir ", sysdev, "/", d->d_name) ;
+      dir_close(dirsub) ;
+      close(fdsub) ;
+    }
+    if (errno) strerr_diefu2sys(111, "readdir ", sysdev) ;
+    dir_close(dirsysdev) ;
+    close(fdsysdev) ;
+  }
+  if (!buffer_flush(buffer_1)) die1() ;
+  return 0 ;
+}
diff --git a/src/mdevd/mdevd-netlink.c b/src/mdevd/mdevd-netlink.c
new file mode 100644
index 0000000..3f55f23
--- /dev/null
+++ b/src/mdevd/mdevd-netlink.c
@@ -0,0 +1,177 @@
+/* ISC license. */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <skalibs/types.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/siovec.h>
+#include <skalibs/buffer.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/error.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/iopause.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/sig.h>
+#include <skalibs/selfpipe.h>
+#include "mdevd.h"
+
+#define USAGE "mdevd-netlink [ -d notification-fd ] [ -v verbosity ] [ -b kbufsz ]"
+#define dieusage() strerr_dieusage(100, USAGE)
+#define dienomem() strerr_diefu1sys(111, "build string") ;
+
+static unsigned int cont = 1, verbosity = 1 ;
+
+static inline ssize_t fd_recvmsg (int fd, struct msghdr *hdr)
+{
+  ssize_t r ;
+  do r = recvmsg(fd, hdr, MSG_DONTWAIT) ;
+  while ((r == -1) && (errno == EINTR)) ;
+  return r ;
+}
+
+static inline int netlink_init_stdin (unsigned int kbufsz)
+{
+  struct sockaddr_nl nl = { .nl_family = AF_NETLINK, .nl_pad = 0, .nl_groups = 1, .nl_pid = 0 } ;
+  close(0) ;
+  if (socket_internal(AF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT, DJBUNIX_FLAG_NB|DJBUNIX_FLAG_COE) < 0
+   || bind(0, (struct sockaddr *)&nl, sizeof(struct sockaddr_nl)) < 0)
+    return 0 ;
+
+  if (setsockopt(0, SOL_SOCKET, SO_RCVBUFFORCE, &kbufsz, sizeof(unsigned int)) < 0
+   && errno == EPERM
+   && setsockopt(0, SOL_SOCKET, SO_RCVBUF, &kbufsz, sizeof(unsigned int)) < 0)
+    return 0 ;
+  return 1 ;
+}
+
+static inline void handle_signals (void)
+{
+  for (;;)
+  {
+    int c = selfpipe_read() ;
+    switch (c)
+    {
+      case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
+      case 0 : return ;
+      case SIGTERM :
+        cont = 0 ;
+        fd_close(0) ;
+        break ;
+      default :
+        strerr_dief1x(101, "internal error: inconsistent signal state. Please submit a bug-report.") ;
+    }
+  }
+}
+
+static inline void handle_stdout (void)
+{
+  if (!buffer_flush(buffer_1) && !error_isagain(errno))
+    strerr_diefu1sys(111, "flush stdout") ;
+}
+
+static inline void handle_netlink (void)
+{
+  struct sockaddr_nl nl;
+  struct iovec v[2] ;
+  struct msghdr msg =
+  {
+    .msg_name = &nl,
+    .msg_namelen = sizeof(struct sockaddr_nl),
+    .msg_iov = v,
+    .msg_iovlen = 2,
+    .msg_control = 0,
+    .msg_controllen = 0,
+    .msg_flags = 0
+  } ;
+  ssize_t r ;
+  buffer_wpeek(buffer_1, v) ;
+  siovec_trunc(v, 2, siovec_len(v, 2) - 1) ;
+  r = sanitize_read(fd_recvmsg(0, &msg)) ;
+  if (r < 0)
+  {
+    if (errno == EPIPE)
+    {
+      if (verbosity >= 2) strerr_warnw1x("received EOF on netlink") ;
+      cont = 0 ;
+      fd_close(0) ;
+      return ;
+    }
+    else strerr_diefu1sys(111, "receive netlink message") ;
+  }
+  if (!r) return ;
+  if (msg.msg_flags & MSG_TRUNC)
+    strerr_diefu2x(111, "buffer too small for ", "netlink message") ;
+  if (nl.nl_pid)
+  {
+    if (verbosity >= 3)
+    {
+      char fmt[PID_FMT] ;
+      fmt[pid_fmt(fmt, nl.nl_pid)] = 0 ;
+      strerr_warnw3x("netlink message", " from userspace process ", fmt) ;
+    }
+    return ;
+  }
+  buffer_wseek(buffer_1, r) ;
+  buffer_putnoflush(buffer_1, "", 1) ;
+}
+
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  iopause_fd x[3] = { { .events = IOPAUSE_READ }, { .fd = 1 }, { .fd = 0 } } ;
+  unsigned int notif = 0 ;
+  PROG = "mdevd-netlink" ;
+  {
+    unsigned int kbufsz = 65536 ;
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "d:v:b:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'd' : if (!uint0_scan(l.arg, &notif) || notif < 3) dieusage() ; break ;
+        case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
+        case 'b' : if (!uint0_scan(l.arg, &kbufsz)) dieusage() ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+    if (!netlink_init_stdin(kbufsz)) strerr_diefu1sys(111, "init netlink") ;
+  }
+
+  x[0].fd = selfpipe_init() ;
+  if (x[0].fd < 0) strerr_diefu1sys(111, "init selfpipe") ;
+  if (selfpipe_trap(SIGTERM) < 0) strerr_diefu1sys(111, "trap SIGTERM") ;
+
+  if (verbosity >= 2) strerr_warni1x("starting") ;
+  if (notif)
+  {
+    fd_write(notif, "\n", 1) ;
+    fd_close(notif) ;
+  }
+
+  while (cont || buffer_len(buffer_1))
+  {
+    int r ;
+    x[1].events = buffer_len(buffer_1) ? IOPAUSE_WRITE : 0 ;
+    x[2].events = buffer_available(buffer_1) >= UEVENT_MAX_SIZE + 1 ? IOPAUSE_READ : 0 ;
+    r = iopause(x, 2 + cont, 0, 0) ;
+    if (r < 0) strerr_diefu1sys(111, "iopause") ;
+    if (!r) continue ;
+    if (x[1].revents & IOPAUSE_EXCEPT) break ;
+    if (x[1].revents & IOPAUSE_WRITE) handle_stdout() ;
+    if (x[0].revents & (IOPAUSE_READ | IOPAUSE_EXCEPT)) handle_signals() ;
+    if (cont && x[2].events & IOPAUSE_READ && x[2].revents & (IOPAUSE_READ | IOPAUSE_EXCEPT))
+      handle_netlink() ;
+  }
+  if (verbosity >= 2) strerr_warni1x("exiting") ;
+  return 0 ;
+}
diff --git a/src/mdevd/mdevd.c b/src/mdevd/mdevd.c
new file mode 100644
index 0000000..2a419bc
--- /dev/null
+++ b/src/mdevd/mdevd.c
@@ -0,0 +1,991 @@
+/* ISC license. */
+
+#include <sys/sysmacros.h>  /* makedev, major, minor */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+#include <signal.h>
+#include <pwd.h>
+#include <grp.h>
+#include <regex.h>
+#include <libgen.h>  /* basename */
+#include <stdio.h>  /* rename */
+#include <skalibs/types.h>
+#include <skalibs/allreadwrite.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/buffer.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/sig.h>
+#include <skalibs/selfpipe.h>
+#include <skalibs/tai.h>
+#include <skalibs/environ.h>
+#include <skalibs/env.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/iopause.h>
+#include <skalibs/skamisc.h>
+#include <skalibs/surf.h>
+#include <skalibs/random.h>
+#include <skalibs/lolstdio.h>
+#include "mdevd.h"
+
+#define USAGE "mdevd [ -v verbosity ] [ -f conffile ] [ -n ] [ -s slashsys ] [ -d slashdev ]"
+#define dieusage() strerr_dieusage(100, USAGE)
+
+#define BUFSIZE 8192
+#define UEVENT_MAX_VARS 63
+
+#define ACTION_NONE 0x0
+#define ACTION_ADD 0x1
+#define ACTION_REMOVE 0x2
+
+static int dryrun = 0 ;
+static int cont = 1 ;
+static pid_t pid = 0 ;
+static unsigned int verbosity = 1 ;
+static char const *slashsys = "/sys" ;
+static char const *fwbase = "/lib/firmware" ;
+static SURFSchedule surf_ctx = SURFSCHEDULE_ZERO ;
+static unsigned int root_maj, root_min ;
+
+struct envmatch_s
+{
+  size_t var ;
+  regex_t re ;
+} ;
+
+struct majmin_s
+{
+  unsigned int maj ;
+  unsigned int minlo ;
+  unsigned int minhi ;
+} ;
+
+union devmatch_u
+{
+  regex_t devre ;
+  struct majmin_s majmin ;
+} ;
+
+#define DEVMATCH_NOTHING 0
+#define DEVMATCH_CATCHALL 1
+#define DEVMATCH_DEVRE 2
+#define DEVMATCH_MAJMIN 3
+
+#define MOVEINFO_NOTHING 0
+#define MOVEINFO_NOCREATE 1
+#define MOVEINFO_MOVE 2
+#define MOVEINFO_MOVEANDLINK 3
+
+typedef struct scriptelem_s scriptelem, *scriptelem_ref ;
+struct scriptelem_s
+{
+  uid_t uid ;
+  gid_t gid ;
+  mode_t mode ;
+  size_t movepath ;
+  size_t command ;
+  union devmatch_u devmatch ;
+  unsigned int envmatchlen : 11 ;
+  unsigned int devmatchtype : 2 ;
+  unsigned int movetype : 2 ;
+  unsigned int cmdtype : 2 ;
+  unsigned int flagcont : 1 ;
+  unsigned short envmatchs ;
+} ;
+
+static scriptelem const scriptelem_catchall =
+{
+  .uid = 0,
+  .gid = 0,
+  .mode = 0660,
+  .movepath = 0,
+  .command = 0,
+  .envmatchlen = 0,
+  .devmatchtype = DEVMATCH_CATCHALL,
+  .movetype = MOVEINFO_NOTHING,
+  .cmdtype = ACTION_NONE,
+  .flagcont = 0
+} ;
+
+struct uevent_s
+{
+  unsigned short len ;
+  unsigned short varn ;
+  unsigned short vars[UEVENT_MAX_VARS + 1] ;
+  char buf[UEVENT_MAX_SIZE + PATH_MAX + 5] ;
+} ;
+#define UEVENT_ZERO { .len = 0, .varn = 0 }
+
+
+ /* Utility functions */
+
+static inline void script_free (scriptelem *script, unsigned short scriptlen, struct envmatch_s *envmatch, unsigned short envmatchlen)
+{
+  unsigned short i = 0 ;
+  for (; i < scriptlen ; i++)
+    if (script[i].devmatchtype == DEVMATCH_DEVRE)
+      regfree(&script[i].devmatch.devre) ;
+  for (i = 0 ; i < envmatchlen ; i++) regfree(&envmatch[i].re) ;
+}
+
+static void mdevd_random_init (void)
+{
+  char seed[160] ;
+  random_makeseed(seed) ;
+  surf_init(&surf_ctx, seed) ;
+}
+
+static inline void surfname (char *s, size_t n)
+{
+  static char const oklist[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZghijklmnopqrstuvwxyz-_0123456789abcdef" ;
+  surf(&surf_ctx, s, n) ;
+  while (n--) s[n] = oklist[s[n] & 63] ;
+}
+
+static inline int mkdirp (char *s)
+{
+  size_t n = strlen(s) ;
+  size_t i = 0 ;
+  for (; i < n ; i++)
+  {
+    if (s[i] == '/')
+    {
+      int r = 0 ;
+      s[i] = 0 ;
+      if (dryrun) strerr_warni2x("dry run: mkdir ", s) ;
+      else r = mkdir(s, 0755) ;
+      s[i] = '/' ;
+      if (r < 0) break ;
+    }
+  }
+  return i >= n ;
+}
+
+static int makesubdirs (char *path)
+{
+  if (strrchr(path, '/') && !mkdirp(path))
+  {
+    if (verbosity) strerr_warnwu2sys("create subdirectories for ", path) ;
+    return 0 ;
+  }
+  return 1 ;
+}
+
+
+ /* mdev.conf parsing. See PARSING.txt for details. */
+
+ /* The first pass is simple. The goal is just to compute scriptlen and envmatchlen. */
+
+static inline unsigned char firstpass_cclass (char c)
+{
+  static unsigned char const classtable[65] = "08888888817881888888888888888888188438888888858888888888888288886" ;
+  return (unsigned char)c < 65 ? classtable[(unsigned char)c] - '0' : 8 ;
+}
+
+static inline void script_firstpass (char *s, unsigned short *scriptlen, unsigned short *envmatchlen)
+{
+  static unsigned char const table[5][9] =
+  {
+    { 0x05, 0x00, 0x06, 0x34, 0x04, 0x01, 0x24, 0x00, 0x22 },
+    { 0x06, 0x06, 0x06, 0x34, 0x06, 0x06, 0x24, 0x06, 0x22 },
+    { 0x06, 0x04, 0x13, 0x02, 0x06, 0x02, 0x02, 0x06, 0x02 },
+    { 0x06, 0x06, 0x06, 0x02, 0x06, 0x02, 0x02, 0x06, 0x02 },
+    { 0x05, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x00, 0x04 }
+  } ;
+  size_t i = 0 ;
+  unsigned short n = 0, m = 0 ;
+  unsigned int state = 0 ;
+  while (state < 5)
+  {
+    unsigned char what = table[state][firstpass_cclass(s[i++])] ;
+    state = what & 0x07 ;
+    if (what & 0x10) m++ ;
+    if (what & 0x20) n++ ;
+  }
+  if (state == 6)
+  {
+    s[--i] = 0 ;
+    while (i && !strchr(" \n\r\t", s[i])) i-- ;
+    strerr_dief2x(2, "syntax error during first pass, after string: ", (char *)s + i) ;
+  }
+
+  *scriptlen = n ;
+  *envmatchlen = m ;
+}
+
+ /* The second pass is the real, complete mdev.conf parsing. */
+
+static inline unsigned char secondpass_cclass (char c)
+{
+  static unsigned char const classtable[65] = "`ppppppppagppappppppppppppppppppampdcppppplpheppnnnnnnnnookbpijpf" ;
+  return (unsigned char)c < 65 ? classtable[(unsigned char)c] - '`' : 16 ;
+}
+
+static inline void script_secondpass (char *s, scriptelem *script, struct envmatch_s *envmatch)
+{
+  static uint32_t const table[30][17] =
+  {
+    { 0x0000001e, 0x00000000, 0x0000001f, 0x40000003, 0x00000001, 0x08000002, 0x20000007, 0x00000040, 0x1400000d, 0x0000001f, 0x0000001f, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d },
+    { 0x0000001e, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000040, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001, 0x00000001 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x40000003, 0x0000001f, 0x0000001f, 0x20000007, 0x0000001f, 0x1400000d, 0x0000001f, 0x0000001f, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d, 0x1400000d },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x04040004, 0x0000001f, 0x04040004, 0x04040004, 0x0000001f, 0x04040004, 0x0000001f, 0x04040004, 0x04040004, 0x04040004, 0x04040004, 0x04040004, 0x04040004, 0x04040004 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x00000004, 0x0000001f, 0x00000004, 0x00000004, 0x0000001f, 0x00000004, 0x02000005, 0x00000004, 0x00000004, 0x00000004, 0x00000004, 0x00000004, 0x00000004, 0x00000004 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000006, 0x04000006, 0x0000001f, 0x04000006, 0x0000001f, 0x04000006, 0x04000006, 0x04000006, 0x04000006, 0x04000006, 0x04000006, 0x04000006 },
+    { 0x0000001f, 0x03000012, 0x0000001f, 0x00000006, 0x0000001f, 0x00000006, 0x00000006, 0x0000001f, 0x00000006, 0x00000006, 0x00000006, 0x00000006, 0x00000006, 0x00000006, 0x00000006, 0x00000006, 0x00000006 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000008, 0x04000008, 0x0000001f },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x02800009, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x00000008, 0x00000008, 0x0000001f },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0400000a, 0x0400000a, 0x0000001f },
+    { 0x0000001f, 0x02600012, 0x0000001f, 0x0000001f, 0x0000001f, 0x0240000b, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000000a, 0x0000000a, 0x0000001f },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0400000c, 0x0400000c, 0x0000001f },
+    { 0x0000001f, 0x02100012, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000000c, 0x0000000c, 0x0000001f },
+    { 0x0000001f, 0x02080012, 0x0000001f, 0x0000000d, 0x0000001f, 0x0000000d, 0x0000000d, 0x0000001f, 0x0000000d, 0x0204000e, 0x0000001f, 0x0000000d, 0x0000000d, 0x0000000d, 0x0000000d, 0x0000000d, 0x0000000d },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0400000f, 0x0000001f, 0x0400000f, 0x0400000f, 0x0000001f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f, 0x0400000f },
+    { 0x0000001f, 0x0000001f, 0x03000010, 0x0000000f, 0x0000001f, 0x0000000f, 0x0000000f, 0x0000001f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f, 0x0000000f },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x04000011, 0x0000001f, 0x0400000d, 0x0400000d, 0x0000001f, 0x0400000d, 0x0000001f, 0x0000001f, 0x0400000d, 0x0400000d, 0x0400000d, 0x0400000d, 0x0400000d, 0x0400000d },
+    { 0x0000001f, 0x02080012, 0x0000001f, 0x00000011, 0x0000001f, 0x00000011, 0x00000011, 0x0000001f, 0x00000011, 0x00000011, 0x00000011, 0x00000011, 0x00000011, 0x00000011, 0x00000011, 0x00000011, 0x00000011 },
+    { 0x0000001f, 0x00000012, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000013, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000013, 0x04000013, 0x04000013 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x00000013, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x02020014, 0x0000001f, 0x0000001f, 0x00000013, 0x00000013, 0x00000013 },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000015, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000015, 0x04000015, 0x04000015 },
+    { 0x0000001f, 0x02010016, 0x0000001f, 0x0000001f, 0x0000001f, 0x00000015, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x00000015, 0x00000015, 0x00000015 },
+    { 0x0000001f, 0x00000016, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x04000017, 0x0000001f, 0x0000001f },
+    { 0x0000001f, 0x02008018, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0200c040, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x00000017, 0x0000001f, 0x0000001f },
+    { 0x0000401e, 0x00000018, 0x0000001f, 0x0000201c, 0x00004001, 0x0000001f, 0x0000101c, 0x00004040, 0x0000001f, 0x00000819, 0x00000419, 0x0000001f, 0x0000301c, 0x0000021b, 0x0000001f, 0x0000001f, 0x0000001f },
+    { 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000011a, 0x0000011a, 0x0000001f, 0x0000011a, 0x0000011a, 0x0000001f, 0x0000011a, 0x0000001f, 0x0000011a, 0x0000011a, 0x0000011a, 0x0000011a },
+    { 0x0000401e, 0x0200001b, 0x0000001f, 0x0000001f, 0x02004001, 0x0000001a, 0x0000001a, 0x02004040, 0x0000001a, 0x0000001a, 0x0000001f, 0x0000001a, 0x0000001f, 0x0000001a, 0x0000001a, 0x0000001a, 0x0000001a },
+    { 0x0000401e, 0x0000001b, 0x0000001f, 0x0000201c, 0x00004001, 0x0000001f, 0x0000101c, 0x00004040, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000301c, 0x0000001f, 0x0000001f, 0x0000001f, 0x0000001f },
+    { 0x0000001f, 0x0000009d, 0x0000001f, 0x0000009d, 0x0000001f, 0x0000009d, 0x0000009d, 0x0000001f, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d, 0x0000009d },
+    { 0x0000401e, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x02004040, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d, 0x0000001d }
+  } ;
+  size_t mark = 0 ;
+  size_t col0 = 0 ;
+  size_t pos = 0 ;
+  unsigned int line = 0 ;
+  uint32_t state = 0 ;
+  unsigned short i = 0 ; /* current scriptelem index */
+  unsigned short j = 0 ; /* current envmatch index */
+  LOLDEBUG("in script_secondpass") ;
+  while (state < 0x1e)
+  {
+    uint32_t what = table[state][secondpass_cclass(s[pos])] ;
+    state = what & 0x1f ;
+    if (what & 0x40000000)
+    {
+      script[i].devmatchtype = DEVMATCH_NOTHING ;
+      script[i].envmatchs = j ;
+    }
+    if (what & 0x20000000) script[i].devmatchtype = DEVMATCH_MAJMIN ;
+    if (what & 0x10000000)
+    {
+      script[i].devmatchtype = DEVMATCH_DEVRE ;
+      script[i].envmatchs = j ;
+    }
+    if (what & 0x08000000) script[i].flagcont = 1 ;
+    if (what & 0x04000000) mark = pos ;
+    if (what & 0x02000000) s[pos] = 0 ;
+    if (what & 0x01000000)
+    {
+      int r = regcomp(&envmatch[j].re, s + mark, REG_EXTENDED) ;
+      if (r)
+      {
+        char errbuf[256] ;
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        regerror(r, &envmatch[j].re, errbuf, 256) ;
+        strerr_dief8x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to compile regular expression ", "for envmatch: ", s + mark, ": ", errbuf) ;
+      }
+      j++ ;
+      script[i].envmatchlen++ ;
+    }
+    if (what & 0x00800000)
+    {
+      if (!uint0_scan(s + mark, &script[i].devmatch.majmin.maj))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to scan major from string: ", s + mark) ;
+      }
+    }
+    if (what & 0x00400000)
+    {
+      if (!uint0_scan(s + mark, &script[i].devmatch.majmin.minlo))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to scan minor from string: ", s + mark) ;
+      }
+    }
+    if (what & 0x00200000) script[i].devmatch.majmin.minhi = script[i].devmatch.majmin.minlo ;
+    if (what & 0x00100000)
+    {
+      if (!uint0_scan(s + mark, &script[i].devmatch.majmin.minhi))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to scan minor from string: ", s + mark) ;
+      }
+    }
+    if (what & 0x00080000)
+    {
+      int r = regcomp(&script[i].devmatch.devre, s + mark, REG_EXTENDED) ;
+      if (r)
+      {
+        char errbuf[256] ;
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        regerror(r, &envmatch[j].re, errbuf, 256) ;
+        strerr_dief8x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to compile regular expression ", " for devmatch: ", s + mark, ": ", errbuf) ;
+      }
+    }
+    if (what & 0x00040000) envmatch[j].var = mark ;
+    if (what & 0x00020000)
+    {
+      struct passwd *pw = getpwnam(s + mark) ;
+      if (pw) script[i].uid = pw->pw_uid ;
+      else if (!uid0_scan(s + mark, &script[i].uid))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to get uid from string: ", s + mark) ;
+      }
+    }
+    if (what & 0x00010000)
+    {
+      struct group *gr = getgrnam(s + mark) ;
+      if (gr) script[i].gid = gr->gr_gid ;
+      else if (!gid0_scan(s + mark, &script[i].gid))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to get gid from string: ", s + mark) ;
+      }
+    }
+    if (what & 0x00008000)
+    {
+      unsigned int m ;
+      if (!uint0_oscan(s + mark, &m))
+      {
+        char fmtline[UINT_MAX] ;
+        fmtline[uint_fmt(fmtline, line)] = 0 ;
+        strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, ": unable to scan mode from string: ", s + mark) ;
+      }
+      script[i].mode = m ;
+    }
+    if (what & 0x00002000) script[i].cmdtype |= ACTION_REMOVE ;
+    if (what & 0x00001000) script[i].cmdtype |= ACTION_ADD ;
+    if (what & 0x00000800) script[i].movetype = MOVEINFO_MOVE ;
+    if (what & 0x00000400) script[i].movetype = MOVEINFO_MOVEANDLINK ;
+    if (what & 0x00000200) script[i].movetype = MOVEINFO_NOCREATE ;
+    if (what & 0x00000100) script[i].movepath = pos ;
+    if (what & 0x00000080) script[i].command = pos ;
+    if (what & 0x00000040) { line++ ; col0 = pos ; }
+    if (what & 0x00004000) i++ ;
+    pos++ ;
+  }
+
+  if (state == 0x1f)
+  {
+    char fmtline[UINT_MAX] ;
+    char fmtcol[UINT_MAX] ;
+    fmtline[uint_fmt(fmtline, line)] = 0 ;
+    fmtcol[uint_fmt(fmtcol, pos - col0 - 1)] = 0 ;
+    strerr_dief5x(2, "syntax error during second pass: ", "line ", fmtline, " column ", fmtcol) ;
+  }
+}
+
+
+ /* Firmware management */
+
+static inline int wait_for_loading (char const *sysdevpath, size_t sysdevpathlen)
+{
+  int lfd = -1 ;
+  unsigned int n = 150 ;
+  static tain_t const period = { .sec = TAI_ZERO, .nano = 200000000 } ;
+  char loadingfn[sysdevpathlen + 9] ;
+  memcpy(loadingfn, sysdevpath, sysdevpathlen) ;
+  memcpy(loadingfn + sysdevpathlen, "/loading", 9) ;
+  while (n--)  /* sysfs doesn't support inotify, so we have to poll -_- */
+  {
+    tain_t deadline ;
+    lfd = open_write(loadingfn) ;
+    if (lfd >= 0) break ;
+    tain_add_g(&deadline, &period) ;
+    deepsleepuntil_g(&deadline) ;
+  }
+  if (ndelay_off(lfd) < 0)
+  {
+    fd_close(lfd) ;
+    return -1 ;
+  }
+  return lfd ;
+}
+
+static inline void load_firmware (char const *fw, char const *sysdevpath)
+{
+  size_t fwbaselen = strlen(fwbase) ;
+  size_t fwlen = strlen(fw) ;
+  size_t sysdevpathlen = strlen(sysdevpath) ;
+  int fwfd, loadingfd ;
+  char fwfn[fwbaselen + fwlen + 2] ;
+  memcpy(fwfn, fwbase, fwbaselen) ;
+  fwfn[fwbaselen] = '/' ;
+  memcpy(fwfn + fwbaselen + 1, fw, fwlen + 1) ;
+  if (dryrun)
+  {
+    strerr_warni5x("dry run: copy ", fwfn, " to ", sysdevpath, "/data") ;
+    return ;
+  }
+  fwfd = open_readb(fwfn) ;
+  if (fwfd < 0 && verbosity >= 2) strerr_warnwu3sys("open ", fwfn, " for reading") ;
+  loadingfd = wait_for_loading(sysdevpath, sysdevpathlen) ;
+  if (loadingfd < 0)
+  {
+    if (verbosity >= 2) strerr_warnwu3sys("open ", sysdevpath, "/loading for writing") ;
+    goto errclosef ;
+  }
+  if (fwfd < 0) goto errclosel ;
+  if (fd_write(loadingfd, "1", 1) < 1)
+  {
+    if (verbosity >= 2) strerr_warnwu3sys("write 1 to ", sysdevpath, "/loading") ;
+    goto errclosel ;
+  }
+  {
+    int datafd ;
+    char datafn[sysdevpathlen + 6] ;
+    memcpy(datafn, sysdevpath, sysdevpathlen) ;
+    memcpy(datafn + sysdevpathlen, "/data", 6) ;
+    datafd = open_write(datafn) ;
+    if (datafd < 0)
+    {
+      if (verbosity >= 2) strerr_warnwu3sys("open ", datafn, " for writing") ;
+      goto errload ;
+    }
+    if (ndelay_off(datafd) < 0)
+    {
+      if (verbosity >= 2) strerr_warnwu2sys("ndelay_off ", datafn) ;
+      goto errload ;
+    }
+    if (fd_cat(fwfd, datafd) < 0)
+    {
+      if (verbosity >= 2) strerr_warnwu4sys("copy ", fwfn, " to ", datafn) ;
+      goto errload ;
+    }
+    fd_close(datafd) ;
+    fd_write(loadingfd, "0", 1) ;
+  }
+  fd_close(loadingfd) ;
+  fd_close(fwfd) ;
+  return ;
+
+ errload:
+  allwrite(loadingfd, "-1", 2) ;
+ errclosel:
+  fd_close(loadingfd) ;
+ errclosef:
+  if (fwfd >= 0) fd_close(fwfd) ;
+}
+
+
+ /* uevent management */
+
+static char *event_getvar (struct uevent_s *event, char const *var)
+{
+  size_t varlen = strlen(var) ;
+  unsigned short i = 1 ;
+  for (; i < event->varn ; i++)
+    if (!strncmp(var, event->buf + event->vars[i], varlen) && event->buf[event->vars[i] + varlen] == '=')
+      break ;
+  return i < event->varn ? event->buf + event->vars[i] + varlen + 1 : 0 ;
+}
+
+static inline unsigned char format_cclass (char c)
+{
+  static unsigned char const classtable[58] = "0333333333333333333333333333333333333133333333332222222222" ;
+  return (unsigned char)c < 58 ? classtable[(unsigned char)c] - '0' : 3 ;
+}
+
+static ssize_t alias_format (char *out, size_t outmax, char const *in, char const *data, regmatch_t const *off)
+{
+  static unsigned char const table[2][4] = { { 0x12, 0x01, 0x10, 0x10 }, { 0x03, 0x10, 0x20, 0x03 } } ;
+  size_t w = 0 ;
+  unsigned int state = 0 ;
+  while (state < 2)
+  {
+    char next = *in++ ;
+    unsigned char what = table[state][format_cclass(next)] ;
+    state = what & 0x03 ;
+    if (what & 0x10)
+    {
+      if (w >= outmax) return (errno = ENAMETOOLONG, -1) ;
+      if (out) out[w] = next ;
+      w++ ;
+    }
+    if (what & 0x20)
+    {
+      unsigned int i = next - '0' ;
+      size_t len = off[i].rm_eo - off[i].rm_so ;
+      if (w + len > outmax) return -1 ;
+      if (out) memcpy(out + w, data + off[i].rm_so, len) ;
+      w += len ;
+    }
+  }
+  if (state == 3) return (errno = EINVAL, -1) ;
+  return w ;
+}
+
+static inline void spawn_command (char const *command, struct uevent_s const *event)
+{
+  char const *argv[4] = { "/bin/sh", "-c", command, 0 } ;
+  size_t envlen = env_len((char const **)environ) ;
+  char const *envp[envlen + event->varn + 1] ;
+  if (!env_merge(envp, envlen + event->varn + 1, (char const **)environ, envlen, event->buf + event->vars[1], event->len - event->vars[1]))
+  {
+    if (verbosity) strerr_warnwu1sys("merge environment to spawn command") ;
+    return ;
+  }
+  pid = child_spawn0(argv[0], argv, envp) ;
+  if (!pid)
+  {
+    if (verbosity) strerr_warnwu1sys("spawn command") ;
+  }
+}
+
+static inline int run_scriptelem (struct uevent_s *event, scriptelem const *elem, char const *storage, struct envmatch_s const *envmatch, char *devname, mode_t devtype, unsigned int action, int mmaj, int mmin)
+{
+  size_t devnamelen = strlen(devname) ;
+  size_t nodelen = 0 ;
+  char *node = event->buf + event->len + 5 ;
+  regmatch_t off[10] ;
+  unsigned short i = 0 ;
+  for (; i < elem->envmatchlen ; i++)
+  {
+    char const *x = event_getvar(event, storage + envmatch[elem->envmatchs + i].var) ;
+    if (!x) return 0 ;
+    if (regexec(&envmatch[elem->envmatchs + i].re, x, 0, 0, 0)) return 0 ;
+  }
+
+  switch (elem->devmatchtype)
+  {
+    case DEVMATCH_NOTHING:
+    case DEVMATCH_CATCHALL: break ;
+    case DEVMATCH_MAJMIN:
+      if (mmaj >= 0 && mmin >= 0 && mmaj == elem->devmatch.majmin.maj && mmin >= elem->devmatch.majmin.minlo && mmin <= elem->devmatch.majmin.minhi) break ;
+      return 0 ;
+    case DEVMATCH_DEVRE:
+      if (!regexec(&elem->devmatch.devre, devname, 10, off, 0)
+       && !off[0].rm_so && off[0].rm_eo == strlen(devname))
+        break ;
+      return 0 ;
+  }
+
+  switch (elem->movetype)
+  {
+    case MOVEINFO_NOTHING :
+    case MOVEINFO_NOCREATE :
+      memcpy(node, devname, devnamelen + 1) ;
+      nodelen = devnamelen ;
+      break ;
+    case MOVEINFO_MOVE :
+    case MOVEINFO_MOVEANDLINK :
+    {
+      ssize_t r = alias_format(node, PATH_MAX, storage + elem->movepath, devname, off) ;
+      if (r <= 1)
+      {
+        if (verbosity) strerr_warnwu5sys("process expression \"", storage + elem->movepath, "\" with devname \"", devname, "\"") ;
+        return -1 ;
+      }
+      if (node[r - 2] == '/')
+      {
+        if (r + devnamelen >= PATH_MAX)
+        {
+          errno = ENAMETOOLONG ;
+          if (verbosity) strerr_warnwu2sys("create alias for ", devname) ;
+          return -1 ;
+        }
+        memcpy(node + r - 1, devname, devnamelen + 1) ;
+        nodelen = r + devnamelen - 1 ;
+      }
+      break ;
+    }
+  }
+  if (elem->movetype != MOVEINFO_NOCREATE && action == ACTION_ADD && mmaj >= 0)
+  {
+    if (!makesubdirs(node)) return -1 ;
+    if (dryrun)
+    {
+      char fmtmaj[UINT_FMT] ;
+      char fmtmin[UINT_FMT] ;
+      char fmtmode[UINT_OFMT] ;
+      fmtmaj[uint_fmt(fmtmaj, mmaj)] = 0 ;
+      fmtmin[uint_fmt(fmtmin, mmin)] = 0 ;
+      fmtmode[uint_ofmt(fmtmode, elem->mode)] = 0 ;
+      strerr_warni6x("dry run: mknod ", node, S_ISBLK(devtype) ? " b " : " c ", fmtmaj, " ", fmtmin) ;
+      strerr_warni4x("dry run: chmod ", fmtmode, " ", node) ;
+    }
+    else if (mknod(node, elem->mode | devtype, makedev(mmaj, mmin)) < 0)
+    {
+      if (errno != EEXIST)
+      {
+        if (verbosity) strerr_warnwu2sys("mknod ", node) ;
+        return -1 ;
+      }
+      if (chmod(node, elem->mode) < 0 && verbosity >= 2)
+        strerr_warnwu2sys("chmod ", node) ;
+    }
+    if (elem->uid || elem->gid)
+    {
+      if (dryrun)
+      {
+        char fmtuid[UID_FMT] ;
+        char fmtgid[GID_FMT] ;
+        fmtuid[uid_fmt(fmtuid, elem->uid)] = 0 ;
+        fmtgid[gid_fmt(fmtgid, elem->gid)] = 0 ;
+        strerr_warni6x("dry run: chown ", fmtuid, ":", fmtgid, " ", node) ;
+      }
+      else if (chown(node, elem->uid, elem->gid) < 0 && verbosity >= 2)
+        strerr_warnwu2sys("chown ", node) ;
+    }
+    if (mmaj == root_maj && mmin == root_min)
+    {
+      if (dryrun) strerr_warni3x("dry run: symlink ", node, " to root") ;
+      else symlink(node, "root") ;
+    }
+    if (elem->movetype == MOVEINFO_MOVEANDLINK)
+    {
+      if (!makesubdirs(devname)) return -1 ;
+      if (dryrun) strerr_warni4x("dry run: symlink ", node, " to ", devname) ;
+      else if (symlink(node, devname) < 0)
+      {
+        if (errno != EEXIST)
+        {
+          if (verbosity)
+            strerr_warnwu4sys("symlink ", node, " to ", devname) ;
+          return -1 ;
+        }
+        else
+        {
+          char tmppath[devnamelen + 20] ;
+          memcpy(tmppath, devname, devnamelen) ;
+          memcpy(tmppath + devnamelen, ":mdevd-", 7) ;
+          surfname(tmppath + devnamelen + 7, 12) ;
+          tmppath[devnamelen + 19] = 0 ;
+          if (symlink(node, tmppath) < 0)
+          {
+            if (verbosity)
+              strerr_warnwu4sys("symlink ", node, " to ", tmppath) ;
+          }
+          else if (rename(tmppath, devname) < 0)
+          {
+            if (verbosity)
+              strerr_warnwu4sys("rename ", tmppath, " to ", devname) ;
+            unlink(tmppath) ;
+          }
+        }
+      }
+    }
+  }
+
+  if (action & elem->cmdtype)
+  {
+    event->vars[event->varn++] = event->len ;
+    memcpy(event->buf + event->len, "MDEV=", 5) ;
+    event->len += 6 + nodelen ;
+    if (dryrun)
+    {
+      strerr_warni2x("dry run: spawn ", storage + elem->command) ;
+      if (verbosity >= 2)
+      {
+        char buf[UEVENT_MAX_SIZE + PATH_MAX + 5] ;
+        size_t j = 0 ;
+        unsigned short i = 1 ;
+        for (; i < event->varn ; i++)
+        {
+          size_t len = strlen(event->buf + event->vars[i]) ;
+          memcpy(buf + j, event->buf + event->vars[i], len) ;
+          buf[j+len] = ' ' ;
+          j += len+1 ;
+        }
+        buf[j-1] = 0 ;
+        strerr_warni2x("dry run: added variables: ", buf) ;
+      }
+    }
+    else spawn_command(storage + elem->command, event) ;
+  }
+
+  if (elem->movetype != MOVEINFO_NOCREATE && action == ACTION_REMOVE && mmaj >= 0)
+  {
+    if (elem->movetype == MOVEINFO_MOVEANDLINK)
+    {
+      if (dryrun) strerr_warni2x("dry run: unlink ", devname) ;
+      else unlink(devname) ;
+    }
+    if (dryrun) strerr_warni2x("dry run: unlink ", node) ;
+    else unlink(node) ;
+  }
+
+  return !elem->flagcont ;  
+}
+
+static inline void run_script (struct uevent_s *event, scriptelem const *script, unsigned short scriptlen, char const *storage, struct envmatch_s const *envmatch, char *devname, mode_t devtype, unsigned int action, int mmaj, int mmin)
+{
+  unsigned short i = 0 ;
+  for (; i < scriptlen ; i++)
+  {
+    int r ;
+    r = run_scriptelem(event, script + i, storage, envmatch, devname, devtype, action, mmaj, mmin) ;
+    if (r) break ;
+  }
+}
+
+static inline void act_on_event (struct uevent_s *event, char *sysdevpath, size_t sysdevpathlen, unsigned int action, scriptelem const *script, unsigned short scriptlen, char const *storage, struct envmatch_s const *envmatch)
+{
+  ssize_t hasmajmin = 0 ;
+  unsigned int mmaj, mmin ;
+  mode_t devtype = S_IFCHR ;
+  char *devname ;
+  char const *x = event_getvar(event, "MAJOR") ;
+  char buf[UEVENT_MAX_SIZE] ;
+  if (action == ACTION_ADD)
+  {
+    if (x && uint0_scan(x, &mmaj))
+    {
+      x = event_getvar(event, "MINOR") ;
+      if (x && uint0_scan(x, &mmin)) hasmajmin = 1 ;
+    }
+    if (!hasmajmin)
+    {
+      memcpy(sysdevpath + sysdevpathlen, "/dev", 5) ;
+      hasmajmin = openreadnclose(sysdevpath, buf, UINT_FMT << 1) ;
+      sysdevpath[sysdevpathlen] = 0 ;
+      if (hasmajmin > 0)
+      {
+        size_t i = uint_scan(buf, &mmaj) ;
+        if (i > 0 && buf[i] == ':')
+        {
+          size_t j = uint_scan(buf + i + 1, &mmin) ;
+          if (j > 0 && buf[i+1+j] == '\n') ;
+          else hasmajmin = 0 ;
+        }
+        else hasmajmin = 0 ;
+      }
+    }
+  }
+
+  devname = event_getvar(event, "DEVNAME") ;
+  if (!devname)
+  {
+    ssize_t r ;
+    memcpy(sysdevpath + sysdevpathlen, "/uevent", 8) ;
+    r = openreadnclose(sysdevpath, buf, UEVENT_MAX_SIZE-1) ;
+    sysdevpath[sysdevpathlen] = 0 ;
+    if (r > 0)
+    {
+      buf[r] = 0 ;
+      devname = strstr(buf, "\nDEVNAME=") ;
+      if (devname)
+      {
+        devname += 9 ;
+        *strchr(devname, '\n') = 0 ;
+      }
+    }
+    if (!devname) devname = basename(sysdevpath) ;
+  }
+  if (strlen(devname) >= PATH_MAX - 1)
+  {
+    if (verbosity) strerr_warnwu2x("device name too long: ", devname) ;
+    return ;
+  }
+  if (strstr(sysdevpath, "/block/")) devtype = S_IFBLK ;
+  else
+  {
+    x = event_getvar(event, "SUBSYSTEM") ;
+    if (x && str_start(x, "block")) devtype = S_IFBLK ;
+  }
+  run_script(event, script, scriptlen, storage, envmatch, devname, devtype, action, hasmajmin > 0 ? mmaj : -1, hasmajmin > 0 ? mmin : -1) ;
+}
+
+static inline void on_event (struct uevent_s *event, scriptelem const *script, unsigned short scriptlen, char const *storage, struct envmatch_s const *envmatch)
+{
+  unsigned int action ;
+  char const *x = event_getvar(event, "ACTION") ;
+  if (!x) return ;
+  if (!strcmp(x, "add")) action = ACTION_ADD ;
+  else if (!strcmp(x, "remove")) action = ACTION_REMOVE ;
+  else return ;
+  x = event_getvar(event, "DEVPATH") ;
+  if (!x) return ;
+  {
+    size_t devpathlen = strlen(x) ;
+    size_t slashsyslen = strlen(slashsys) ;
+    char sysdevpath[devpathlen + slashsyslen + 2 + 7] ;
+    memcpy(sysdevpath, slashsys, slashsyslen) ;
+    sysdevpath[slashsyslen] = '/' ;
+    memcpy(sysdevpath + slashsyslen + 1, x, devpathlen + 1) ;
+    x = event_getvar(event, "FIRMWARE") ;
+    if (action == ACTION_ADD || !x) act_on_event(event, sysdevpath, slashsyslen + devpathlen + 1, action, script, scriptlen, storage, envmatch) ;
+    if (action == ACTION_ADD && x) load_firmware(x, sysdevpath) ;
+  }
+}
+
+
+ /* Tying it all together */
+
+static inline int handle_signals (void)
+{
+  for (;;)
+  {
+    int c = selfpipe_read() ;
+    switch (c)
+    {
+      case -1 : strerr_diefu1sys(111, "selfpipe_read") ;
+      case 0 : return 0 ;
+      case SIGHUP : return 1 ;
+      case SIGCHLD :
+        if (!pid) wait_reap() ;
+        else
+        {
+          int wstat ;
+          int r = wait_pid_nohang(pid, &wstat) ;
+          if (r < 0)
+            if (errno != ECHILD) strerr_diefu1sys(111, "wait_pid_nohang") ;
+            else break ;
+          else if (!r) break ;
+          pid = 0 ;
+        }
+        break ;
+      default :
+        strerr_dief1x(101, "internal error: inconsistent signal handling. Please submit a bug-report.") ;
+    }
+  }
+}
+
+static void handle_stdin (struct uevent_s *event, scriptelem const *script, unsigned short scriptlen, char const *storage, struct envmatch_s const *envmatch, size_t *w)
+{
+  while (!pid)
+  {
+    ssize_t r ;
+    if (event->len >= UEVENT_MAX_SIZE)
+      strerr_dief2x(1, "received invalid event: ", "too long") ;
+    r = sanitize_read(getlnmax(buffer_0, event->buf + event->len, UEVENT_MAX_SIZE - event->len, w, '\0')) ;
+    if (r < 0)
+    {
+      cont = 0 ;
+      if (errno != EPIPE && verbosity) strerr_warnwu1sys("read from stdin") ;
+      if (event->len) strerr_dief1x(1, "received incomplete event") ;
+    }
+    if (r <= 0) break ;
+    if (*w > 1)
+    {
+      if (event->varn >= UEVENT_MAX_VARS)
+        strerr_dief2x(1, "received invalid event: ", "too many variables") ;
+      event->vars[event->varn++] = event->len ;
+      event->len += *w ;
+    }
+    else
+    {
+      if (event->varn > 1) on_event(event, script, scriptlen, storage, envmatch) ;
+      event->len = 0 ;
+      event->varn = 0 ;
+    }
+    *w = 0 ;
+  }
+}
+
+int main (int argc, char const *const *argv)
+{
+  char const *configfile = "/etc/mdev.conf" ;
+  iopause_fd x[2] = { { .events = IOPAUSE_READ }, { .fd = 0 } } ;
+  PROG = "mdevd" ;
+  {
+    char const *slashdev = "/dev" ;
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "nv:f:s:d:F:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'n' : dryrun = 1 ; break ;
+        case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
+        case 'f' : configfile = l.arg ; break ;
+        case 's' : slashsys = l.arg ; break ;
+        case 'd' : slashdev = l.arg ; break ;
+        case 'F' : fwbase = l.arg ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+    if (configfile[0] != '/') strerr_dief1x(100, "conffile must be an absolute path") ;
+    if (chdir(slashdev) < 0) strerr_diefu2sys(111, "chdir to ", slashdev) ;
+  }
+
+  if (strlen(slashsys) >= PATH_MAX - 1) strerr_dief1x(100, "paths too long") ;
+  if (!fd_sanitize()) strerr_diefu1sys(111, "sanitize standard fds") ;
+
+  {
+    struct stat st ;
+    if (stat("/", &st) < 0) strerr_diefu1sys(111, "stat /") ;
+    root_maj = major(st.st_dev) ;
+    root_min = minor(st.st_dev) ;
+  }
+
+  if (ndelay_on(0) < 0) strerr_diefu1sys(111, "set stdin nonblocking") ;
+  x[0].fd = selfpipe_init() ;
+  if (x[0].fd < 0) strerr_diefu1sys(111, "init selfpipe") ;
+  if (sig_ignore(SIGPIPE) < 0) strerr_diefu1sys(111, "ignore SIGPIPE") ;
+  {
+    sigset_t set ;
+    sigemptyset(&set) ;
+    sigaddset(&set, SIGCHLD) ;
+    sigaddset(&set, SIGHUP) ;
+    if (selfpipe_trapset(&set) < 0)
+      strerr_diefu1sys(111, "trap signals") ;
+  }
+  mdevd_random_init() ;
+  umask(0) ;
+
+  while (cont || pid)
+  {
+    ssize_t len ;
+    unsigned short scriptlen = 0 ;
+    unsigned short envmatchlen = 0 ;
+    char buf[BUFSIZE] ;
+    len = openreadnclose(configfile, buf, BUFSIZE - 1) ;
+    if (len < 0)
+    {
+      if (errno != ENOENT) strerr_diefu2sys(111, "read ", configfile) ;
+      strerr_warnwu2sys("read ", configfile) ;
+      len = 0 ;
+    }
+    buf[len++] = 0 ;
+    script_firstpass(buf, &scriptlen, &envmatchlen) ;
+
+    {
+      size_t w = 0 ;
+      struct uevent_s event = UEVENT_ZERO ;
+      struct envmatch_s envmatch[envmatchlen ? envmatchlen : 1] ;
+      scriptelem script[scriptlen + 1] ;
+      memset(script, 0, scriptlen * sizeof(scriptelem)) ;
+      script[scriptlen++] = scriptelem_catchall ;
+      LOLDEBUG("before script_secondpass: len: %lld  scriptlen: %hu  envmatchlen: %hu  sizeof(scriptelem): %llu", len, scriptlen, envmatchlen, sizeof(scriptelem)) ;
+      script_secondpass(buf, script, envmatch) ;
+      while (cont || pid)
+      {
+        static tain_t const deadline = TAIN_INFINITE ;
+        if (buffer_len(buffer_0)) handle_stdin(&event, script, scriptlen, buf, envmatch, &w) ;
+        x[1].events = pid ? 0 : IOPAUSE_READ ;
+        if (iopause_g(x, 1 + cont, &deadline) < 0) strerr_diefu1sys(111, "iopause") ;
+        if (x[0].revents & IOPAUSE_READ && handle_signals()) break ;
+        if (cont && !pid && x[1].revents & IOPAUSE_READ)
+          handle_stdin(&event, script, scriptlen, buf, envmatch, &w) ;
+      }
+      script_free(script, scriptlen, envmatch, envmatchlen) ;
+    }
+  } 
+  return 0 ;
+}
diff --git a/src/mdevd/mdevd.h b/src/mdevd/mdevd.h
new file mode 100644
index 0000000..a99f692
--- /dev/null
+++ b/src/mdevd/mdevd.h
@@ -0,0 +1,8 @@
+ /* ISC license. */
+
+#ifndef MDEVD_H
+#define MDEVD_H
+
+#define UEVENT_MAX_SIZE 4096
+
+#endif